Average movecount: 15.0
Average double turns: 2.7
All L cases are 15 moves long.
If a large 2x2 block is solved, it is the 2-twist case. If there are no blocks (2 cases) then the 2x2 blocks will look like either an H perm or a Z perm.
If there are two blocks; then they may look like a Y perm (1 case) which is simply two sune algorithms connected with a U move; or a J perm (2 cases), i.e. either a Ja or a Jb; or a T perm (2 cases) i.e. either a vertical T perm or a horizontal T perm. The horizontal T perm and the Jb perm are simply 2 sune algorithms connected with a U move.
The 1 block cases (4 cases) can be identified by the position of the block.
Note, these rules are only to make learning of these cases simpler. For speed, a better recognition system is to be adopted.